css - 仅将平边应用于 Accordion

Question

我发现这段代码可以使 Angular 变平。它工作得很好，但它把一切都变直了。我如何将其仅限于 Accordion 。我试着给它一个 ID 并应用到它，但是当我这样做时它停止工作。谁能告诉我正确的方法。提前致谢!

 * {
        border-radius: 0 !important;
    }

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="accordion" class="panel-group">
    <div class="panel panel-default">
        <div class="panel-heading">
            <h4 class="panel-title">
                <a data-toggle="collapse" data-parent="#accordion" href="#collapseOne">1. What is HTML?</a>
            </h4>
        </div>
        <div id="collapseOne" class="panel-collapse collapse">
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                <p>HTML stands for HyperText Markup Language. HTML is the standard markup language for describing the structure of web pages. <a href="https://www.tutorialrepublic.com/html-tutorial/" target="_blank">Learn more.</a></p>
            </div>
        </div>
    </div>
    <div class="panel panel-default">
        <div class="panel-heading">
            <h4 class="panel-title">
                <a data-toggle="collapse" data-parent="#accordion" href="#collapseTwo">2. What is Bootstrap?</a>
            </h4>
        </div>
        <div id="collapseTwo" class="panel-collapse collapse in">
            <div class="panel-body">
                <p>Bootstrap is a sleek, intuitive, and powerful front-end framework for faster and easier web development. It is a collection of CSS and HTML conventions. <a href="https://www.tutorialrepublic.com/twitter-bootstrap-tutorial/" target="_blank">Learn more.</a></p>
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    <div class="panel panel-default">
        <div class="panel-heading">
            <h4 class="panel-title">
                <a data-toggle="collapse" data-parent="#accordion" href="#collapseThree">3. What is CSS?</a>
            </h4>
        </div>
        <div id="collapseThree" class="panel-collapse collapse">
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Answer 1

您需要指定目标元素。例如:

 #accordion, #accordion * {
    border-radius: 0 !important;
 }

上面的代码会将 css 规则应用于 Accordion 及其所有子项。

稍微不同的是，我不确定您为什么要在这种情况下使用 !important。